Interpreting time-integrated polarization data of gamma-ray burst prompt emission

Aims. With the accumulation of polarization data in gamma-ray burst (GRB) prompt phase, models can be tested. Methods. We predicted time-integrated polarizations 37 GRBs with observation. used their observed spectral parameters to do this. In model, emission mechanism is synchrotron radiation, and magnetic field configuration region was assumed large-scale ordered. Therefore, degrees (PDs) are upper limits. Results. For most detected by Gamma-ray Burst Polarimeter (GAP), POLAR, AstroSat, PD match corresponding PD. Hence synchrotron-emission model a ordered interpret both moderately low PDs ($\sim10\%$) POLAR relatively high ($\sim45\%$) GAP AstroSat well. fields these GRB phases or at least during peak times dominated component. However, 110721A 180427A lower than values. Because an predicts upper-limit for models, observations two bursts challenge model. Then we predict High-energy Polarimetry Detector (HPD) Low-energy (LPD) on board upcoming POLAR-2. concentrated values HPD will higher LPD, which might different from predictions dissipative photosphere more accurate multiband highly desired test phase.